68 HONETMAN — ON THE GEOLOGY OF NOVA SCOTIA. 



and on tlie sides of the brook. It assumes the form of a sjncline. 

 Part of it, therefore, belongs to another series of silurian strata. 

 This outcrop is doubtless an extension of the lower Helderberg of 

 Blanchard, on McDonald's Mountain. 



I sent a collection of fossils from this locality to the museum of 

 the Survey. This new series of strata, of which the lower Helder- 

 berg part is exposed, enters into the formation of McLellan's moun- 

 tain. Simon Fraser's mountain shews an outcrop of greenstone in 

 the line of axis No. 2. This line then runs in a south east direc- 

 tion, having first one outcrop of greenstone with red porphyry, and 

 then two other outcrops ; and then it is possible that there is no 

 other outcrop until Blanchard is reached. Parallel with this line 

 is a fine exposure of Medina sandstone strata, overlaid by Clinton 

 shales. On the side of the road ascending the mountain named, I 

 was very fortunate to find a mass of rock having abundance of 

 characteristic petraia and trumpet-shaped cornulites of Salter's Re- 

 port, and an organism which I did not recognise, but which I con- 

 sidered to be possibly the pygidium of a trilobite. In similar posi- 

 tions I generally find the petraia in the form of casts — internal and 

 external. Here I find the organism itself, as* I get it on the shore 

 between Doctor's brook and Arisaig. I also found other specimens 

 throughout the outcrop, but they were by no means so abundant as 

 my first success led me to expect. I did not find any in the Clinton 

 strata of this band. These are doubtless an extension of the strata 

 of Blanchard, containing the bed of iroyi ore. 



I did not find fossils in any of the other strata between this and 

 the fossiliferous lovfcr Helderberg of McLellan's brook. However 

 it is something to have characteristic fossils from the highest and low- 

 est parts of a series. I found the greenstone of axis No. 2 also 

 exposed in the church yard, near the Presbyterian church of Mc- 

 Lellan's Mountain, and two considerable outcrops still farther north, 

 having an extension of the Medina slate of Simon Eraser's mountain. 

 "West of these is a considerable outcrop of slates, which probably 

 belong to the other side of the synclinal. These are succeeded in 

 the same direction by conglomerates, containing a dyke of green- 

 stone. It is quite possible that these may be a continuation of axis 

 No. 2, farther north, as I have not examined in that direction. 



